Two-stage VIS: Several VIS methods [1]}, [2]}, [3]} adapt the two-stage pipeline, such as Mask R-CNN [4]} by introducing an additional tracking branch for target association. The work of [2]} introduces MaskTrack R-CNN that jointly performs detection, segmentation and tracking. Bertasius et al. [1]} utilize a branch in Mask R-CNN to propagate frame-level instance masks based on deformable convolutions from each frame to other video frames within a temporal neighborhood. The work of [3]} introduces a modified variational autoencoder (VAE) on top of Mask R-CNN for instance-level video segmentation and tracking.
